AD 2016-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | AgustaWestland | S.p.A. (Agusta) | Airworthiness Directives; AgustaWestland S.p.A. (Agusta) Helicopters |
Unsafe Condition
Loss of hydraulic power to the flight controls and subsequent loss of control of the helicopter due to potential failures in the hydraulic systems, including power control modules (PCMs), tail shut-off valve, flight control shut-off valves, and emergency landing gear shut-off valve.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform operational checks of both hydraulic systems, including the Number 1 and Number 2 hydraulic systems power control modules (PCMs), the tail shut-off valve, the PCM1 and PCM2 flight control shut-off valves, and the emergency landing gear shut-off valve. Depending on the results, replace a PCM, the tail shut-off valve, a flight control shut-off valve, the number 2 hydraulic control panel, the number 1 hydraulic module, the number 1 or number 2 PCM pressure switch, or repair the electrical wiring.
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Compliance Time
Within 50 hours time-in-service (TIS)
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Affected Aircraft
Agusta Model AB139 and AW139 helicopters, all serial numbers except seria
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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